Curling iron



FIG. 1 is a perspective front elevational view of a curling iron showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof; 

The ornamental design for a curling iron, substantially as shown and described. 